MIC2584/2585
Micrel
MIC2584/2585
26
March 2005
PCB Layout Considerations
Because of the low values of the sense resistors used with the
MIC2584/85 controllers, special attention to the layout must
be used in order for the devices circuit breaker function to
operate properly. Specifically, the use of a 4-wire Kelvin
connection to accurately measure the voltage across R
SENSE
is highly recommended. Kelvin sensing is simply a means of
making sure that any voltage drops in the power traces
connecting to the resistors does not get picked up by the
traces themselves. Additionally, these Kelvin connections
should be isolated from all other signal traces to avoid
introducing noise onto these sensitive nodes. Figure 14
illustrates a recommended, multi-layer layout for the R
SENSE
,
Power MOSFET, timer(s), and feedback network connec-
tions. The feedback network resistor values are selected for
a 12V application. Many hot swap applications will require
load currents of several amperes. Therefore, the power (V
CC
and Return) trace widths (W) need to be wide enough to allow
the current to flow while the rise in temperature for a given
copper plate (e.g., 1oz. or 2oz.) is kept to a maximum of
10癈 ~ 25癈. Also, these traces should be as short as
possible in order to minimize the IR drops between the input
and the load. For a starting point, there are many trace width
calculation tools available on the web such as the following
link:
http://www.aracnet.com/cgi-usr/gpatrick/trace.pl
Finally, the use of plated-through vias will be needed to make
circuit connections to power and ground planes when utilizing
multi-layer PC boards.
Via to
GND plane
S
S
S
G
D
D
D
D
**C
GATE
Via to
GND plane
**R
GATE
93.1k
1%
12.4k
1%
*POWER MOSFET
(SO-8)
*SENSE RESISTOR
(2512)
W
Current Flow
to the Load
Current Flow
from the Load
Current Flow
to the Load
DRAWING IS NOT TO SCALE
Similar considerations should be used for Channel 2.
*See Table 5 for part numbers and vendors.
**Optional components.
Trace width (W) guidelines given in "PCB Layout Recommendations" section of the datasheet.
W
W
9
10
11
12
16
15
14
13
Figure 14. Recommended PCB Layout for Sense Resistor, Power MOSFET and Feedback Network
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相关PDF资料
MIC2586R-2BM TR
IC CTRLR/SEQ HOT SWAP 14-SOIC
MIC2587R-2BM TR
IC CTRLR HOT SWAP POS HV 8-SOIC
MIC2590B-5BTQ TR
IC PCI HOT PLUG CTLR DUAL 48TQFP
MIC2591B-2BTQ TR
IC PCI HOT PLUG CTLR DUAL 48TQFP
MIC2592B-2BTQ TR
IC PCI HOT PLUG CTLR DUAL 48TQFP
MIC2593-2BTQ TR
IC PCI HOT PLUG CTLR DUAL 48TQFP
MIC2594-2BM TR
IC CTRLR HOT SWAP NEG HV 8-SOIC
MIC2595R-2BM TR
IC CTRLR HOT SWAP NEG HV 14-SOIC
相关代理商/技术参数
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功能描述:热插拔功率分布 Positive High Voltage Hot-Swap Controller/Sequencer - Lead Free
RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
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RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MIC2586-2BM
功能描述:IC CTRLR/SEQUENCE HOTSWAP 14SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件
MIC2586-2BM TR
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MIC2586-2YM
功能描述:热插拔功率分布 Positive High Voltage Hot-Swap Controller/Sequencer - Lead Free
RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MIC2586-2YM TR
功能描述:热插拔功率分布 Positive High Voltage Hot-Swap Controller/Sequencer - Lead Free
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